Merge pull request #17886 from edx/mduboseedx/bulk_email_courseauth_description_fix

Correct mention of old course ID format in the description for Course Authorization Bulk Email tool

lms/djangoapps/bulk_email/admin.py

@@ -70,7 +70,7 @@ class CourseAuthorizationAdmin(admin.ModelAdmin):
         (None, {
             'fields': ('course_id', 'email_enabled'),
             'description': '''
-Enter a course id in the following form: Org/Course/CourseRun, eg MITx/6.002x/2012_Fall
+Enter a course id in the following form: course-v1:Org+CourseNumber+CourseRun, eg course-v1:edX+DemoX+Demo_Course
 Do not enter leading or trailing slashes. There is no need to surround the course ID with quotes.
 Validation will be performed on the course name, and if it is invalid, an error message will display.